this post was submitted on 23 Mar 2025
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As is so often the case, wikipedia has a helpful map https://en.wikipedia.org/wiki/24-hour_clock#/media/File:12_24_Hours_World_Map.svg
For all of exclusively 12 hour, exclusively 24 hour, 24 hour in writing but 12 hour in speech, and just using both at random, there are entire regions of the world using that system